-73.13% is the change from 670 to 180
Calculation steps:
[( 180 - 670 ) ÷ 670] x 100 = -73.13%
Formula
Percentage change = [(180 - 670) / 670] x 100
Subtract the new number by the original number
180 - 670 = -490
-490 ÷ 670 = -0.7313432835820896
-0.7313432835820896 x 100 = -73.13%